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http://dx.doi.org/10.6113/JPE.2012.12.3.495

Improved Grid Voltage Control Strategy for Wind Farms with DFIGs Connected to Distribution Networks  

Zhang, Xueguang (Dept. of Electrical Engineering, Harbin Institute of Technology)
Pan, Weiming (Dept. of Electrical Engineering, Harbin Institute of Technology)
Liu, Yicheng (Dept. of Electrical Engineering, Harbin Institute of Technology)
Xu, Dianguo (Dept. of Electrical Engineering, Harbin Institute of Technology)
Publication Information
Journal of Power Electronics / v.12, no.3, 2012 , pp. 495-502 More about this Journal
Abstract
This paper presents an improved grid voltage control strategy for wind farms with doubly-fed induction generators (DFIGs) connected to distribution networks based on an analysis of the operation limits of DFIG systems. A modified reactive power limit calculation method in different operation states is proposed and a reactive power control strategy during grid voltage dips/rises is further discussed. A control strategy for compensating unbalanced grid voltage, based on DFIG systems, by injecting negative sequence current into the grid through the grid side converter (GSC) is proposed. In addition, the negative current limit of the GSC is discussed. The distribution principle of the negative sequence current among the different DFIG systems in a wind farm is also introduced. The validity of the proposed voltage control strategy is demonstrated by Matlab/Simulink simulations. It is shown that the stability of a wind farm and the power grid can be improved with the proposed strategy.
Keywords
Distribution networks; Doubly fed induction generator wind farm; Grid voltage control; Negative sequence voltage compensation;
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